954 INDEX GENERUM MAMMALIUM. 
Elaphus—Continued. 
Species: Cervus elaphus, from Europe; Cervus canadensis, from northeastern North 
America; Cervus occidentalis, from northwestern North America; and Cervus 
wallichii from Nepal, India. 
Elaphus: £A cos, deer. 
Elasmodon FarcoxEn, 1846. Ungulata, Proboscidea, Elephantid:e. 
** Fauna Antiqua Sivalensis,’’ 1846; Palcont. Memoirs, I, 20-21, 477 footnote, 1868. 
Species: Elephas hysudricus Falconer, and E. namadicus Falconer, from the Pleis- 
tocene of the Narbada Valley, India. 
“The designation of Elasmodus having been preoccupied by Sir Philip Egerton 
for a series of fossil fish, Dr. Falconer, in 1857 [Quart. Journ. Geol. Soc., Lon- 
don, XIII, 315], substituted ZZuelephas for Elasmodon”’ (1. c., p. 477, 1868). 
Extinct. 
Elasmodon: éAa6mos, a thin plate; 650v=66 ovs, tooth—in allusion to the lami- 
nar pattern of the molars. 
Elasmognathus Git, 1865. Ungulata, Perissodactyla, Tapiride. 
Proc. Acad. Nat. Sci. Phila., 1865, 183. 
Type: Elasmoganthus bairdii Gill, from Panama. 
Name preoccupied by Elasmognathus Fieber,* 1844, a genus of Hemiptera. 
Replaced by Tapirella Palmer, 1903. 
Elasmognathus: éXa6m0s, a thin plate; y «foc, jaw—in allusion to the promi- 
nent ossified nasal septum or prolongation of the mesethmoid, and the thin 
lamelliform expansions of the supramaxillaries. (GILL. ) 
Elasmotherium G. Frscugn, 1808. Ungulata, Perissodactyla, Rhinocerotide. 
Programme d' Invitation Séance Pub. Soc. Imp. Nat. Moscou, 23-28, 2 plates, 1808; 
Mém. Soc. Imp. Nat. Moscou, II, 253, 255-260, tab. xxr, xxir, 1809; V, 413, 
1817; Zoognosia, III, 335-337, 1814. 
Type: Elasmotherium sibiricum Fischer, from the Pleistocene in the vicinity of 
Miask, Siberia. 
Extinct. Based on a lower jaw. 
Elasmotherium: éAa6m0s, a thin plate; 6ypiov, wild beast—in allusion to the 
enamel plates of the molars. 
Electra (subgenus of Lagenorhynchus) Gray, 1866. Cete, Delphinidz. 
Cat. Seals & Whales Brit. Mus., 268-272, 1866; Synopsis Whales & Dolphins 
Brit. Mus., 7, 1868 (raised to generic rank); Suppl. Cat. Seals & Whales Brit. 
Mus., 76, 1871. 
Species, 7: Lagenorhynchus electra Gray (type), locality unknown; Delphinus 
cexruleo-albus Meyen, from the east coast of South America; Lagenorhynchus 
asia Gray, locality unknown; Phocena acutus Gray, from the North Sea; 
Lagenorhynchus clanculus Gray, from the Pacific Ocean; Delphinus breviceps 
Pucheran, from the Rio de La Plata, and Lagenorhynchus thicolea Gray, from 
the west coast of North America. 
Name preoccupied by Electra Lamouroux, 1816, a genus of Polyps; and by Electra 
Stephens, 1829, a genus of Lepidoptera. 
Electra: ' HAékrpa, Electra—in Greek mythology, a nymph, daughter of Oceanus 
and Tethys, wife of Thaumas and mother of the Harpies. 
Eleotragus Gray, 1848. Ungulata, Artiodactyla, Bovidee. 
List Spec. Mamm. Brit. Mus., pp. xxvi, 165, 1843; Ann. & Mag. Nat. Hist., 
X VIII, 232, 1846; Scr ATER & THomas, Book of Antelopes, II, pt. vir, 155, 1897 
(in synonymy, type fixed). 
Heleotragus KirK, Proc. Zool. Soe. London, 1864, 657—658. 

* Entom. Mon. Abhandl. K. Bóhm. Gesellsch. Wiss., V, Bd. 3, pp. 90-91, 1844. 
